f-prot's setup.iss

[maniaq]

I created setup.iss file and there a line

szDir=E:\Program Files\FSI\F-Prot

and i don't want the "E:\"

i want something like %ProgramFiles%, but when i write %ProgramFiles% windows doesn't understand whats that, so my question how could i change it??

[maniaq]

can i make this o ntunonceex.cmd

REG ADD %KEY%\020 /VE /D "F-prot 3.16b lite" /f

REG ADD %KEY%\020 /V 1 /D "%PP%\f-prot.exe /INSTALLDIR=&ProgramFiles&\F-Prot" /f